Modelling thermo-acoustic instabilities of an anchored laminar flame in a simple lean premixed combustor: including hydrodynamic effects

摘要

Lean premixed combustors reduce oxide of nitrogen (NO_x) emissions but are also prone to self sustained thermo-acoustic instabilities. Attempting to model these instabilities has become a popular research topic, and asymptotic based flame modelling allows us to capture all of the length scales involved in the instability. This paper presents a method for solving the full acoustic, hydrodynamic and flame coupling of an anchored laminar V-flame within a simple combustor. This allows us to model the Darrieus-Landau instability effects, and show how they influence the general behaviour and stability of the combustor when compared to G-Equation numerical results.